Something like Kog'maw, he is probably the most awesome looking champion in the game. I'm fed up with these human champions, they're both uninteresting in design and abilities, and they always end up as OP on release. I'm hoping for some AP monster champ, no matter if it is AP carry or AP Bruiser or whatever.

Some sort of medic that uses that... "medical magic"-stuff along with medical supplies, perhaps from Demacia, that could be played as support.
I don't know, but I have just had in mind some sort of "field medic" support for LoL. I'm aware it might sound dumb.

pure support would be nice with mana and health restoring abilities and maybe a shield or teleport ulti

A sea nymph with Storm/lightning/Aquatic themed abilities, along the lines what Tempest Janna could have been if she wasn't air themed. Never know it could happen, I wanted to play a Fae Sorceress and look who popped up! so who knows! lol.